CN111722103A - A Calculation Method of Speed and Stroke of 252kV GIS Disconnector - Google Patents

Abstract

The invention belongs to the technical field of action parameter detection of electric power equipment, and in particular relates to a method for calculating the speed and travel of a 252kV GIS isolating switch, which is suitable for calculating the action speed and travel of a 252kV GIS internal isolating switch when it is opened and closed. The invention includes the contact action speed and travel algorithms of the angle type isolating switch and the linear isolating switch. The algorithm of the invention is simple and accurate, easy to program implementation and instrument development, and can meet the action accuracy requirements of the isolation switch and the evaluation of reliability after action. The invention can comprehensively judge whether the disconnecting switch has faults such as insufficient opening and closing, poor contact of contacts, and unseparated contacts, which is of great significance to the safety and stability of GIS equipment, and greatly reduces the total shutdown of the substation caused by the hidden switch of the disconnecting switch. , reduce economic losses and provide guarantee for the sustainable development of the national economy.

Description

A Calculation Method for Speed and Stroke of 252kV GIS Disconnector

technical field

The invention belongs to the technical field of action parameter detection of electric power equipment, and in particular relates to a method for calculating the speed and travel of a 252kV GIS isolating switch, which is suitable for calculating the action speed and travel of a 252kV GIS internal isolating switch when it is opened and closed.

Background technique

The Chinese name of GIS is fully enclosed gas-insulated combined electrical appliances, English is _{GasInsulatedSubstation} , referred to as GIS, GIS encapsulates circuit breakers, isolating switches, grounding switches, voltage transformers, busbars, etc. Gas acts as insulation. At present, GIS has been widely used in the power system. Most of the new substations are GIS combined electrical substations.

The function of the isolation switch is to provide a running circuit when the power equipment is in normal operation. When the circuit is in power failure or maintenance, it provides a reliable breakpoint to ensure the safety of equipment and personnel. The isolating switches in GIS are divided into bus isolating switches and line isolating switches according to their functions, and are divided into angle isolating switches and linear isolating switches according to their structural forms. The objects involved in the present invention are the angle isolating switch and the linear isolating switch in 252kV GIS.

The operating experience shows that the accident rate of the disconnector is very high. Among them, the failure of the contact opening and closing and the poor contact of the contact are one of the faults that affect the safety of the equipment and the power grid. When the contacts of the isolation switch are in poor contact, the contact between the contacts will increase, and the contact resistance will generate heat under the action of the current, and the heat will further increase the resistance, so a vicious circle occurs, when the temperature of the contact resistance reaches the contact resistance. When the head metal melts, fusion welding will occur at the contact part; if the temperature further increases, the hardness of the metal becomes soft, and finally the contact melts, causing a serious power grid accident. Due to the closed nature of the GIS, the actual situation of the isolating switch is invisible, and the real state of the contacts after the action is unknown. Once the above fault occurs, it will bring huge economic losses.

At present, there are mature instruments for testing the mechanical characteristics of switches in the society, and there are many types, but they are only suitable for circuit breakers, not for isolation switches. It is exposed and visible. The speed sensor is placed on the insulating pull rod. When the circuit breaker operates, the opening and closing speed and stroke curve of the circuit breaker can be directly measured. The mechanical structure of the isolating switch is very different from that of the circuit breaker. It consists of a series of transmission components, including connecting rods, gears, chains, etc., and the conversion and transmission relationship is more complicated. Even in the GIS, there is a certain transmission relationship. Therefore, the mechanical characteristic parameters of the isolating switch cannot be tested by the mechanical characteristic tester of the circuit breaker. It needs some conversion and derivation to obtain the action parameters of the contact of the isolating switch inside the GIS.

SUMMARY OF THE INVENTION

Aiming at the problems existing in the above-mentioned prior art, the present invention provides a method for calculating the speed and stroke of a 252kV GIS isolating switch, specifically a calculation method for the average speed and stroke of the contacts of a 252kV GIS internal angle isolating switch and a linear isolating switch. method. Its purpose is to be able to be used for 252kV GIS internal angle isolating switch and linear isolating switch to detect the contact travel, contact overtravel, contact separation distance and contact opening and closing speed when opening and closing. Developed to facilitate the reliability evaluation of the isolation switch after the action.

In order to achieve the above object, the technical scheme adopted in the present invention is:

A calculation method for the speed and stroke of a 252kV GIS isolating switch, including the contact action speed and stroke algorithm of the angle isolating switch and the linear isolating switch.

In the angle isolating switch, when the outer arm A moves left or right under the drive of pin C, the inner arm moves up and down circularly with pin B as the center, and the moving contact conductor is driven by pin A to make a circular motion. Moving up and down; the moving contact conductor is oriented by the guide rod, and the moving contact conductor moves up and down in a straight line; when the moving contact conductor is inserted into the static contact conductor, the circuit is turned on to realize closing, otherwise it is opening.

For the linear isolation switch, when the outer arm B makes a circular motion, it drives the gear C to make a circular motion at the same time, the gear C meshes with the gear B, and drives the gear A to make a circular motion through the shaft; Drive the moving contact conductor to move up and down in a straight line; when the moving contact conductor is inserted into the static contact conductor, the circuit is turned on to realize closing, otherwise it is opening.

The algorithm of the average speed and stroke of the contact action of the angle type isolating switch includes the following steps:

Known parameters: the rotation angle θ of the outer arm measured by the angular displacement sensor, the action time t of the contact, and the length L of the inner arm;

It can be seen from Figure 1 that the angle of rotation of the outer crank arm is the angle of rotation of the inner crank arm, and the angular velocity of the inner crank arm is w:

ω=θ/t(1)

The linear speed of the inner arm is not only the linear speed of the moving contact conductor, but also the average speed v of the moving contact conductor action:

v=L·ω=L·θ/t(2)

Since the movement trajectory of the moving contact conductor is a linear motion, the chord length of the sector formed by the inner arm from the starting position to the end position is the stroke c of the moving contact conductor:

The algorithm for the average speed and travel of the contact of the linear isolation switch includes the following steps:

Known parameters: the rotation angle θ of the outer arm B measured by the angular displacement sensor, the action time t of the contact, the radius r ₁ of the gear A, the radius r ₂ of the gear B, and the radius r ₃ of the gear C;

The rotation angle θ of the outer arm B is the rotation angle θ of the gear C, then the rotation arc length l3 _of the gear C is:

l ₃ =πθr ₃ /180(4)

_The arc length rotated by gear C is the arc length rotated by gear B, and the angle θ2 rotated by gear B is:

θ ₂ =θ·r ₃ /r ₂ (5)

_The angle θ2 of gear B rotation is the angle rotated by gear A, and the arc length of rotation of gear A is obtained as l:

l=πθr ₁ r ₃ /180/r ₂ (6)

The rotation arc length of gear A is the distance c traveled by the contact;

The linear velocity of gear A is v:

v=θr ₃ r ₁ /r ₂ /t(7)

Thereby, the average speed and stroke of the moving contact can be obtained.

The distance k0 between the contacts of the isolation switch in the 252kV GIS and the overtravel h0 of the contacts are known, and the distance k0+overtravel h0=stroke c, it can be seen that the calculated value of the contact travel and the distance k0 The difference of , the overtravel of the contact can be obtained, so as to judge the contact condition of the contact.

The reliability evaluation method after the action of the isolation switch in the 252kV GIS is as follows:

If c-k0=h0, the contact is good;

If 0<c-k0<h0, the contact is poor;

If c-k0≤0, there is no contact.

A computer storage medium storing a computer program on the computer storage medium, when the computer program is executed by a processor, realizes the steps of the method for calculating the speed and the stroke of a 252kV GIS isolation switch.

The advantages and beneficial effects of the present invention are:

The algorithm of the invention is developed in combination with the actual structure and action conditions of the isolation switch in the 252kV GIS. The algorithm is simple and accurate, easy to program and develop, and can meet the action accuracy requirements of the isolation switch and the evaluation of its reliability after operation.

The present invention tests the motor current of the operating mechanism and the rotation angle of the arm when the isolation switch in the GIS is in motion. The difference between the start time and the end time of the motor current is the action time of the isolation switch. Measured by the angular displacement sensor, and then combined with the transmission ratio inside the isolator to calculate the walking distance and average speed of the contacts, and comprehensively judge whether the disconnector has insufficient opening and closing, poor contact, and unseparated contacts, etc. The failure is of great significance to the safety and stability of GIS equipment, greatly reducing the total shutdown of the substation caused by the hidden switch of the disconnector, reducing economic losses, and providing a guarantee for the sustainable development of the national economy.

Description of drawings

In order to facilitate understanding and implementation of the present invention by those of ordinary skill in the art, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments, but it should be understood that the protection scope of the present invention is not limited by the accompanying drawings and specific embodiments.

Fig. 1 is the structural representation of the 252kV GIS interior angle isolating switch of the present invention;

FIG. 2 is a schematic structural diagram of a linear isolation switch in a 252kV GIS of the present invention.

In the figure: pot insulator 1, GIS metal shell 2, static contact conductor 3, moving contact conductor 4, conductor 5, guide rod 6, inner arm 7, outer arm A8, pin A9, pin B10, pin C11 ; Gear A12, shaft 13, gear B14, gear C15, outer arm B16, rack 17.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The invention is a method for calculating the speed and stroke of a 252kV GIS isolating switch, mainly aiming at the calculation of the contact speed and stroke of the 252kV GIS internal angle isolating switch and the linear isolating switch, and the GIS internal isolating switches of other voltage levels and similar structures. The calculation of the contact speed and stroke is also within the scope of the present invention.

Since the crutch arm is outside the GIS, when it moves, its motion parameters can be obtained directly through the sensor. The movement track of the crank arm is driven by the connecting rod to make an arc movement around the shaft pin at one end, and the angular displacement sensor is placed on the shaft pin. When the crank arm moves, the angular displacement sensor senses the rotation angle of the crank arm, thereby Obtain the external parameters when the isolation switch in the GIS operates. The moving contact of the isolating switch is connected to the outer arm through a series of transmission relationships. Using the conversion relationship between these transmission ratios and the rotation angle of the arm, the contact speed and stroke of the isolating switch can be calculated.

Example 1

As shown in Figure 1, Figure 1 is a schematic structural diagram of the 252kV GIS interior angle isolating switch of the present invention. The angle isolating switch is a device operated on site, and is also a power device detected by the present invention. The angle isolating switch includes a basin insulator 1, GIS metal shell 2, static contact conductor 3, moving contact conductor 4, conductor 5, guide rod 6, inner arm 7, outer arm A8, pin A9, pin B10 and pin C11. The connection relationship of the angle isolating switch is: when the outer arm A8 moves left or right under the drive of the pin C11, the inner arm 7 makes a circular motion up and down with the pin B10 as the center, and drives the moving contact through the pin A9. The head conductor 4 moves up and down. Since the moving contact conductor 4 is oriented and connected in the pot insulator 1 through the guide rod 6, the moving contact conductor 4 moves up and down linearly. When the moving contact conductor 4 is inserted into the static contact conductor 3 When the circuit is turned on, closing is realized, otherwise it is opening. The outside of the pot insulator 1 is provided with a GIS metal shell 2 , and a conductor 5 is connected to the movable contact conductor 4 . The present invention is an algorithm developed for the average speed of movement and the distance or travel of the moving contact conductor 4 when it moves.

Example 2

As shown in Figure 2, Figure 2 is a schematic diagram of the structure of the linear isolation switch in the 252kV GIS of the present invention. The linear isolation switch is a device running on site, and it is also a power device detected by the present invention. The linear isolation switch includes: a basin insulator 1. GIS metal shell 2, static contact conductor 3, moving contact conductor 4, conductor 5, gear A12, shaft 13, gear B14, gear C15, outer arm B16 and rack 17. The connection relationship of the linear isolation switch is: when the outer arm B16 makes a circular motion, it drives the gear C15 to make a circular motion at the same time. The gear C15 meshes with the gear B14, and drives the gear A12 to make a circular motion through the shaft 13. 17 engages, thereby driving the moving contact conductor 4 to move up and down linearly. When the moving contact conductor 4 is inserted into the static contact conductor 3, the circuit is turned on to realize closing, otherwise it is opening. The outside of the pot insulator 1 is provided with a GIS metal shell 2 , and a conductor 5 is connected to the movable contact conductor 4 . The present invention is an algorithm developed for the average speed of movement and the distance or travel of the moving contact conductor 4 when it moves.

Example 3

The invention is a calculation method for the speed and travel of a 252kV GIS isolating switch, including the contact action speed and travel algorithms of the angle isolating switch and the linear isolating switch. Specifically, the motor current of the operating mechanism and the rotation angle of the crank arm are tested when the isolation switch in the GIS is in motion. The angular displacement sensor is used to measure, and then combined with the transmission ratio inside the isolating switch to calculate the walking distance and average speed of the contact. The contact speed and travel algorithms of the angle-type isolating switch and the linear isolating switch are given below.

1. The algorithm of the average speed and stroke of the contact action of the angle isolation switch includes the following steps:

Known parameters: the rotation angle θ of the outer arm 8 measured by the angular displacement sensor, the action time t of the contact, and the length L of the inner arm 7 .

It can be seen from Fig. 1 that the rotation angle of the outer crutch arm 8 is the rotation angle of the inner crutch arm 7, and the angular velocity of the inner crutch arm 7 is w:

ω=θ/t(1)

The linear speed of the inner arm 7 is not only the linear speed of the moving contact conductor 4, but also the average speed v of the moving contact conductor 4:

v=L·ω=L·θ/t(2)

Since the movement trajectory of the moving contact conductor 4 is a linear motion, the chord length of the sector formed by the inner arm 7 from the starting position to the ending position is the stroke c of the moving contact conductor 4:

2. The average speed and stroke algorithm of the linear isolation switch contact action, including the following steps:

Known parameters: the rotation angle θ of the outer arm B16 measured by the angular displacement sensor, the action time t of the contact, the radius r 1 of the gear A12, the radius r ₂ of the gear B14, and the radius r _{3 of} the gear C15.

It can be seen from Figure 2 that the angle θ of the rotation of the outer crank arm B16 is the angle θ of the rotation of the gear C15, and the rotation arc length l3 _of the gear C15 is:

l ₃ =πθr ₃ /180(4)

The arc length rotated by gear C15 is the arc length rotated by gear B14, and the angle θ ₂ of gear B14 rotation is:

θ ₂ =θ·r ₃ /r ₂ (5)

_The angle θ2 of gear B14 rotation is the angle rotated by gear A12, and the arc length of rotation of gear A12 is obtained as l:

l=πθr ₁ r ₃ /180/r ₂ (6)

The rotation arc length of the gear A12 is the distance c traveled by the contacts.

The linear velocity of gear A12 is v:

v=θr ₃ r ₁ /r ₂ /t(7)

Thereby, the average speed and stroke of the moving contact can be obtained.

For the 252kV GIS internal isolation switch, the distance k0 between the contacts and the overtravel h0 of the contacts are designed, the distance k0+overtravel h0=stroke c, it can be seen that the contact calculated by the software The difference between the stroke value and the distance k0 can be used to obtain the overtravel of the contact, thereby judging the contact condition of the contact.

If c-k0=h0, the contact is good;

If 0<c-k0<h0, the contact is poor;

If c-k0≤0, there is no contact.

The above algorithm combined with the specific size parameters and action parameters of the isolation switch in the 252kV GIS can be realized through self-programming, and then developed into the instrument to realize the operation reliability analyzer of the isolation switch in the 252kV GIS.

Example 4

Based on the same inventive concept, an embodiment of the present invention further provides a computer storage medium, where a computer program is stored on the computer storage medium. The steps described in the calculation method of the average speed and stroke of the contact of a 252kV GIS internal isolation switch.

As will be appreciated by those skilled in the art, the embodiments of the present application may be provided as a method, a system, or a computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present application. It will be understood that each flow and/or block in the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to the processor of a general purpose computer, special purpose computer, embedded processor or other programmable data processing device to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing device produce Means for implementing the functions specified in a flow or flow of a flowchart and/or a block or blocks of a block diagram.

These computer program instructions may also be stored in a computer readable memory capable of directing a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer readable memory result in an article of manufacture comprising instruction means, the instructions The apparatus implements the functions specified in the flow or flow of the flowcharts and/or the block or blocks of the block diagrams.

These computer program instructions can also be loaded on a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that The instructions provide steps for implementing the functions specified in the flow or blocks of the flowcharts and/or the block or blocks of the block diagrams.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: the present invention can still be Modifications or equivalent replacements are made to the specific embodiments of the present invention, and any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention shall be included within the protection scope of the claims of the present invention.

Claims (8)

1. A method for calculating the speed and the stroke of a 252kV GIS isolating switch is characterized by comprising the following steps: the method comprises the contact action speed and stroke algorithm of the angle type disconnecting switch and the linear type disconnecting switch.

2. The method for calculating the speed and the stroke of the 252kV GIS isolating switch according to claim 1, wherein the method comprises the following steps: when the outer crank arm A (8) moves leftwards or rightwards under the drive of the pin C (11), the inner crank arm (7) makes up-and-down circular motion by taking the pin B (10) as a circle center, and drives the moving contact conductor (4) to make up-and-down motion through the pin A (9); the moving contact conductor (4) is oriented through the guide rod (6), and the moving contact conductor (4) moves up and down linearly; when the moving contact conductor (4) is inserted into the static contact conductor (3), the loop is conducted to realize closing, otherwise, the loop is opened.

3. The method for calculating the speed and the stroke of the 252kV GIS isolating switch according to claim 1, wherein the method comprises the following steps: when the outer crank arm B (16) does circular motion, the linear type isolating switch simultaneously drives the gear C (15) to do circular motion, the gear C (15) is meshed with the gear B (14), and the gear A (12) is driven to do circular motion through the shaft (13); the gear A (12) is meshed with the rack (17), so that the moving contact conductor (4) is driven to do vertical linear motion; when the moving contact conductor (4) is inserted into the static contact conductor (3), the loop is conducted to realize closing, otherwise, the loop is opened.

4. The method for calculating the speed and the stroke of the 252kV GIS isolating switch according to claim 1, wherein the method comprises the following steps: the angular type disconnecting switch contact motion average speed and stroke algorithm comprises the following steps:

the known parameters are: the angular displacement sensor measures the rotation angle theta of the outer crank arm, the action time t of the contact and the length L of the inner crank arm;

the angle that outer connecting lever pivoted is inner connecting lever pivoted angle promptly, then inner connecting lever's angular velocity is w:

ω＝θ/t (1)

the linear velocity of the inner crank arm is the linear velocity of the moving contact conductor, namely the average velocity v of the moving contact conductor action:

v＝L·ω＝L·θ/t (2)

because the motion trail of the moving contact conductor is linear motion, the chord length of the inner crank arm forming a sector from the initial position to the final position is the stroke c of the moving contact conductor:

5. the method for calculating the speed and the stroke of the 252kV GIS isolating switch according to claim 1, wherein the method comprises the following steps: the linear type disconnecting switch contact motion average speed and stroke algorithm comprises the following steps:

the known parameters are: the rotation angle theta of the outer crank arm B, the action time t of the contact and the radius r of the gear A are measured by the angular displacement sensor₁Radius r of gear B₂Radius r of gear C₃；

The rotating angle theta of the outer crank arm B is the rotating angle theta of the gear C, and the rotating arc length l of the gear C is₃Comprises the following steps:

l₃＝πθr₃/180 (4)

the arc length of the gear C is the arc length of the gear B, and the angle theta of the gear B rotation₂Comprises the following steps:

θ₂＝θ·r₃/r₂(5)

angle theta of rotation of gear B₂I.e. the angle the gear a rotates, from which the arc length of rotation of the gear a is determined as l:

l＝πθr₁r₃/180/r₂(6)

the rotating arc length of the gear A is the walking distance c of the contact;

linear velocity of gear a is v:

v＝θr₃r₁/r₂/t (7)

so as to obtain the action average speed and the stroke of the movable contact.

6. The method for calculating the speed and the stroke of the 252kV GIS isolating switch according to claim 1, wherein the method comprises the following steps: the opening distance k0 separating the contacts of the switch in the 252kVGIS and the overtravel h0 of the contacts are known, and the opening distance k0+ the overtravel h0 are equal to the stroke c, so that the overtravel of the contacts can be obtained by calculating the difference between the calculated contact stroke value and the opening distance k0, and the contact condition of the contacts can be judged.

7. The method for calculating the speed and the stroke of the 252kV GIS isolating switch according to claim 6, wherein the method comprises the following steps: the reliability evaluation method after the switch action is separated in the 252kV GIS comprises the following steps:

if c-k0 ═ h0, the contact is good;

poor contact if 0< c-k0< h 0;

if c-k0 is less than or equal to 0, then no contact is made.

8. A computer storage medium, characterized by: the computer storage medium stores a computer program which, when executed by a processor, implements the steps of a method for calculating the speed and travel of a 252kV GIS disconnector according to claims 1-7.

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